Die for forming auger-bits



(No Model.)

J. BAILEY. DIE FOR FORMING AUGER BITS.

Patented Jan. 21. 1890.

Sudan-fox l wi t/messes forms the axis of UNITED STATES PATENT OFFICE.

DIE FOR FORMING AUGER BITS.

SPECIFICATION forming part of Letters Patent No. 419,622, dated January21, 1890.

Application filed July 22, 1889. Serial No. 318,336. (No model.)

To all whom it may concern:

Be it known that I, JOSIAH BAILEY, a citi zen of the United States,residing at \Vilmington, in the county of Clinton and State of Ohio,have invented certain new and useful Improvements in Dies for FormingSingle Spiral Angers; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The object of my invention is to produce a set of two half-dies in oneor more transverse sections, each of which dies shall have a recess ofsuch shape that when the faces of said dies are pressed together theoutlines of said recesses shall exactly correspond, and any mass ofmetal placed between said dies shall be pressed into the shape of aspiral auger of a certain peculiar form herein to be described.

In the drawings, Figures 1 and 2 represent the facesof the twocorresponding half-dies. Figs. 3 and 4 represent cross-sections of Figs.1 and 2 upon the lines 3 3 and 4: 4, respectively. Fig. 5represents anauger of the peculiar shape formed by my dies.

The auger herein referred to is of the shape described and claimed inUnited States Patent No. 413,159, granted to me October 22, 1889. It hasthe characteristic features of form and the advantages of operation dulyset out in the specification of the said patent, as follows:

The main single spiral web (1, terminating in the chip-removing edge andlip f, allows the utmost-space for the removal of the chips after theyhave been broken up by the edge and lip f. At the same time thenecessary strength is preserved by making the inner edge of the mainspiral blade, that which the spiral, of sufficient thickness, and thenallowing said blade to taper off to a considerable degree of thinness atthe outer edge. Thus is produced a shape which combines and attains theconflicting objects of strength and freedom from choking. The cutter 2'is firmly mounted 011 the short auxiliary spiral h, and performs itsoi'fice without in any way interfering with the upward passage of thechips. The power for driving the anger is transmitted through the stock6 and the anger is drawn down to its work by the screw-point g.

The dies for forming this auger consist of two half portions A and B,which have in their faces the main zigzag recesses D D, the outlines ofwhich exactly correspond when the dies are placed one upon the otherface to face. These recesses are so shaped that when measured at anypoint along a line perpendicular to the spiral formed by themsuch asline 5 5 of Fig. 5they will be thickest at that portion nearest the axisof the spiral-that is, toward the inner edge of the blade, and growthence constantly thinner toward the outer edge of said blade. Thus thecrosssection of this recess in each die is a segment of an oval with thelarger. end toward the central line of the die.

In Fig.3 the half oval D in full lines shows the section 011 line 3 3 ofFig. 1,while the dotted segment of an oval D shows a section 011 line 33 of Fig. 1. The thick portion b of the recess is always toward the axisof the spiral, and from this portion the recess grows thinner constantlytoward the edge in all the three sections D D D, as shown. Thesemicircle a 0 indicates the limiting semi-cylindrical volume withinwhich the recess D is confined and beyond which it at no point extends.In the same way the semicircle a 0' outlines the extreme edge of therecessD in the die B.

It'is of course evident that the sections D, D, and D are taken onplanes 00 a: perpendicular to the axis of the auger spiral, and

consequently their dimensions are not exactly the same as those whichwould be obtained by measuring along the line 5 5 and along linesparallel to 5 fore described; but the characteristics of theintersecting curves are the same, so that the sections D, D, and D willdo for purposes of illustration to give an idea of the general shape ofthe cross-section of the blade.

The recess l-I (shown in Fig. 1) forms the short auxiliary spiral 72,for supporting the cutter. This cutter is formed by the recesses I I.The chip-removing edge and lip f on the end of the main spiral web areformed by the recesses F F. The point g is similarly formed by therecesses G G. The

stock e is formed by the recesses E E.

5, in the manner hereinbe- I have shown the recesses G G with spiralgrooves for forming the screw-thread on the point g. In some cases itmight be desirable to have these recesses plain and out the threadafterward by the proper tools.

When the auger to be formed is of small diameter and not of greatlength,it is possible to form the entire tool from point to stock by twosingle dies A and B; but when the anger is of considerable diameter andlength it is necessary to divide the dies into transverse sections A B AB A B, &c., upon the verse sections for forming an auger with a lines 11, 2 2, 3 3, and 4 at. Then only one pair of corresponding sections willbe used at a time. In this way the amount of metal being operated uponat any time is small, and

consequently the pressure necessary to drive it into the recesses of thedies will not be great enough to break or crush the dies themselves.

In operation I use preferably a rod of iron which is heated to a hightemperature and placed between the two dies or between two correspondingsection's thereof. The dies are then forced together .by the blows of ahammer or by steady pressure-such as that of a hydraulic pressand theportion of the iron rod between the dies is formed into the shape of ananger,

The dies may be guided by the pins P P P", &c., entering the holes 19, pp, 850., so that the opposing recesses will register ex-v actly one withanother.

Having therefore described my invention, what I claim as new, and desireto protect by Letters Patent, is

1. A set of dies for forming an anger with a single main spiral blade,each of which dies has a zigzag recess of constantly. varyingcross-section, said recess being so shaped that when at any point it ismeasured along a line perpendicular to the blade of the main spiralwhich would be formed therein the recess is thickest at that portionwhich forms the axis of the spiral and grows thence constantly thinnerout toward that portion of the recess, or of the corresponding recess inthe other die, that forms the edge of the main spiral blade,substantially as described.

2. A set of dies made in one or more transsingle main spiral blade, eachof which dies has a zigzag recess of constantly varying cross-section,said recess being so shaped that when at any point it is'ineasured alonga line perpendicular to the blade of the main spiral which would beformed therein the recess is thickest at that portion which forms theaxis of the spiral and grows thence constantly thinner out toward thatportion of the recess, or of the corresponding recess in the other die,that forms the edge of the main spiral blade, said dies having also thecorresponding recesses E E, for forming the stock of the anger, therecesses G G, for form- 1 ing the point, the recesses I I, for forming 3the cutter, the recesses H H, for forming the auxiliary supportingspiral for said cutter, and the recesses F F, for forming thechipreinoving edge and lip, substantially as described.

JOSIAH BAILEY.

In presence o'f V A. E. CLEVENGER, J. M. GUSTUS.

